Fix style

src/smolagents/models.py

@@ -603,9 +603,12 @@ class OpenAIServerModel(Model):
         tools_to_call_from: Optional[List[Tool]] = None,
     ) -> ChatMessage:
         messages = get_clean_message_list(
-            messages, role_conversions=(
-                self.custom_role_conversions if self.custom_role_conversions else tool_role_conversions
-            )
+            messages,
+            role_conversions=(
+                self.custom_role_conversions
+                if self.custom_role_conversions
+                else tool_role_conversions
+            ),
         )
         if tools_to_call_from:
             response = self.client.chat.completions.create(